So, I usually see maybe 2 people on invincible, this week I've seen about 5 different people on invincible. What's weirder is that I saw invincible drop last week (didn't win the roll, but I don't mind, it's cool, but it's not Al'ar, gonna farm it solo when I get more gear). And my friend also had it drop today (he won his roll xD). So I guess that makes the count for the zombie horse 7.
Anyone else notice this? Maybe it's just coincidence.